Jean baptiste arban was professor of cornet at the Paris conservatoire in the19th century. He wrote a definitive method for cornet playing that is still used today. It has technical exercises that will improve your playing if you practice them carefully and diligently (perhaps even in your arbor)

Three copies passed through my hands in the early years, but I never did find a music stand strong enough to support them. Then I removed all the binding stuff, divided the book into sections, and solved the problem.